. The Street railway journal . a longhub projecting out on each side ; upon thishub are two corresponding clutches so at-tached to the gear that they revolve with it,but are free to move endwise in either di-rection, so as to engage with the fixedclutches upon the axle—one pair of clutchesdriving in one direction, and the other inan opposite direction ; when the clutchesare central the axle is free to revolve ineither direction, and the gear remains atrest. These clutches are operated from theplatfonns of the cars by small treadles,placed one upon each platform. Pressureupon either treadle loc
. The Street railway journal . a longhub projecting out on each side ; upon thishub are two corresponding clutches so at-tached to the gear that they revolve with it,but are free to move endwise in either di-rection, so as to engage with the fixedclutches upon the axle—one pair of clutchesdriving in one direction, and the other inan opposite direction ; when the clutchesare central the axle is free to revolve ineither direction, and the gear remains atrest. These clutches are operated from theplatfonns of the cars by small treadles,placed one upon each platform. Pressureupon either treadle locks the clutch in suchway as to cause the car when attached tothe cable to move in the direction of thetreadle pressed upon, and in the directionof the travel of the cable. The gear is driven by a pinion one-halfthe diameter of the gear ; upon the side ofthis pinion are friction plates preferably ofleather, clamped between iron discs ; thediscs are fastened to the shaft and revolvewith it; the pinion is loose upon the friction plates pressing upon the sides ofthe pinion cause it to revolve, at firstslowly. As the car attains momentum theslip between the friction plates and thepinion grows less, and soon they are revolv-ing together; this, however, but for oneinstant, for when the pinion is revolvingwith the shaft and friction plates, the carhas reached the speed of the cable, thaclutch is then automatically thrown out,and the gear ceases to act. The difference between the speed of thecable and the speed of the car, until thecar has attained the sijeed of the cable, istaken up by the friction plates. The throw-ing out of the clutch is signaled to thebrakeman upon the platform of the car bythe striking of a small gong bell, and by therising at his feet of the small treadle withwhich he locked the clutch. He then givesa slight turn to his brakestafi, locking thecable in the solid dies. The sheave pinion and gear are used tomultiply the power taken from the cableand as the
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
